Not at all. I broke it down an padded/checked it with my big bag. They looked at it (I had an inspection notice) but no worries. I stayed at the Wyndham on Cable beach. The coins were all over. I had $75 detector and found all those coins in just four hours over 3 hunts; all in dry sand. Coins were everywhere.
Oh, and I called first. Coin hunting is allowed. Relic hunting needs permission. Beach hunting is always considered coin hunting. I also talked to local cops and the hotel manager. Both they said, 'no worries.'
Jason